150 STRONG. [Vol. X. 



The preceding table of the roots and branches of the IX + X 

 is given for clearness. It is imperfect in some particulars and 

 a number of points are assumed. The motor fibres especially 

 require further investigation, nor can the different roots be 

 follov/ed through separately, if, indeed, they do remain sepa- 

 rate, which is not probable. Yet it will give, I believe, some 

 insight into the composition of this complex. 



4. The Sympathetic. 



The general relations of the sympathetic to the vago-glosso- 

 pharyngeal and Gasserian ganglia may be quite briefly ex- 

 pressed. From the ganglion cervicale sympathicum (see chart) 

 one or more branches pass to the vago-glossopharyngeal gan- 

 glia. One twig especially can be traced curving around the 

 inner and then the dorsal side of the caudal apex of the inner 

 ganglion. The greater part of this twig unites with the R. 

 auricularis. Other minute twigs may be seen ramifying around 

 the ganglia and appear to pass off, in part, to the various 

 branches. I have not observed any especial supply to the R. 

 visceralis and the latter must be regarded as composed very 

 largely of fibres from the Vagus. The same probably applies 

 to its subdivision, the R. cardiacus. 



From the various parts of the IX + X, especially the fine- 

 fibred portions of the trunk and branches, are often seen vaso- 

 motor fibres given off to blood vessels. Along these nerves 

 also, especially the R. visceralis and Rr. pharyngei, particularly 

 among their twigs, are found ganglion cells. These cells usu- 

 ally have a bipolar appearance, but when examined closely 

 one or both of their processes show here and there a splitting 

 indicating a multiple character (PI. XI, Figs. 41, 42, and 43). 

 The process or processes from one end may supply a blood 

 vessel, as is beautifully shown in PL VIII, Fig. 13. At other 

 times it apparently innervates epithelium, though this is not so 

 certain. Whether all these vaso-motor fibres are derived from 

 the sympathetic, cannot be determined, but I regard it highly 

 probable that they are not, and that a proportion of them are 

 from the Vago-glossopharyngeus. This is what would be 



